Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ddff195c67362a…

MALICIOUS

PDF

84.8 KB Created: 2021-08-18 22:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d1bc11d29e86415a9883afacaf65ea24 SHA-1: e67a37062565fca0be71ad088783544243e5faf7 SHA-256: 41ddff195c67362aa974a038092919f298868b3ec2654dcc95795f6d71425e8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML classifier score. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/032214ee4a1865e77b68bb4299c82a19/tejifevuxojovezuwasow.pdf In PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/70786924087.pdfIn PDF document text
    • https://bdcomunicazione.it/file/84542400690.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/loxubew.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tasagojekamatubadi.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/96107558145.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/222jg3pg2glvq64ucqm9mbg0t2/2253953952.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210720_80ED37313150F3ED.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ca8e7d1de6d227aa3d66ba3208562955/fobapigibobo.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/wawemo.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/xegan.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/poxalusotate.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0da69e18---zitavupagakajevikodavogam.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/30176462c3d71f0dd60140df51f9c51c/10643325885.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/84367838581.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa427a6063e---siforuwofazuxavaza.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/5651938741.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/89094515858.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/10537948872.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/jubizenazufapirig.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/misogegawatimokapitab.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/rikiwemujomuteranusep.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f56e23bb1---79306016695.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/66258069279.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/133ae81156f8fdd930b11dd38445d3b6/14959511457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=traductor+de+ingles+a+espa%C3%B1ol+con+fotoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 11064 bytes
SHA-256: 74ad2c9c1fa94ed8f1bfdd48754b5f82421aa9063e18997fac6b8db730f54362
font_02_sfnt_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 18164 bytes
SHA-256: 390d506f24103a1b420105849847298450c1cc99ca07c9c58417d88ee3901ba2